1. Faculty of Agriculture, Utsunomiya University, Utsunomiya, Japan
2. United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan
3. Research and Training Institute of Forestry and Wood Industry, Mongolian University of Science and Technology, Ulaanbaatar, Mongolia
4. Faculty of Forestry, Gadjah Mada University, Yogyakarta, Indonesia
5. Forest Tree Breeding Center, Forestry and Forest Products Research Institute, Hitachi, Japan